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[linux-2.6] / drivers / char / tpm / tpm_atmel.c
1 /*
2  * Copyright (C) 2004 IBM Corporation
3  *
4  * Authors:
5  * Leendert van Doorn <leendert@watson.ibm.com>
6  * Dave Safford <safford@watson.ibm.com>
7  * Reiner Sailer <sailer@watson.ibm.com>
8  * Kylene Hall <kjhall@us.ibm.com>
9  *
10  * Maintained by: <tpmdd_devel@lists.sourceforge.net>
11  *
12  * Device driver for TCG/TCPA TPM (trusted platform module).
13  * Specifications at www.trustedcomputinggroup.org       
14  *
15  * This program is free software; you can redistribute it and/or
16  * modify it under the terms of the GNU General Public License as
17  * published by the Free Software Foundation, version 2 of the
18  * License.
19  * 
20  */
21
22 #include <linux/platform_device.h>
23 #include "tpm.h"
24
25 /* Atmel definitions */
26 enum tpm_atmel_addr {
27         TPM_ATMEL_BASE_ADDR_LO = 0x08,
28         TPM_ATMEL_BASE_ADDR_HI = 0x09
29 };
30
31 /* write status bits */
32 enum tpm_atmel_write_status {
33         ATML_STATUS_ABORT = 0x01,
34         ATML_STATUS_LASTBYTE = 0x04
35 };
36 /* read status bits */
37 enum tpm_atmel_read_status {
38         ATML_STATUS_BUSY = 0x01,
39         ATML_STATUS_DATA_AVAIL = 0x02,
40         ATML_STATUS_REWRITE = 0x04,
41         ATML_STATUS_READY = 0x08
42 };
43
44 static int tpm_atml_recv(struct tpm_chip *chip, u8 *buf, size_t count)
45 {
46         u8 status, *hdr = buf;
47         u32 size;
48         int i;
49         __be32 *native_size;
50
51         /* start reading header */
52         if (count < 6)
53                 return -EIO;
54
55         for (i = 0; i < 6; i++) {
56                 status = inb(chip->vendor->base + 1);
57                 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
58                         dev_err(chip->dev,
59                                 "error reading header\n");
60                         return -EIO;
61                 }
62                 *buf++ = inb(chip->vendor->base);
63         }
64
65         /* size of the data received */
66         native_size = (__force __be32 *) (hdr + 2);
67         size = be32_to_cpu(*native_size);
68
69         if (count < size) {
70                 dev_err(chip->dev,
71                         "Recv size(%d) less than available space\n", size);
72                 for (; i < size; i++) { /* clear the waiting data anyway */
73                         status = inb(chip->vendor->base + 1);
74                         if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
75                                 dev_err(chip->dev,
76                                         "error reading data\n");
77                                 return -EIO;
78                         }
79                 }
80                 return -EIO;
81         }
82
83         /* read all the data available */
84         for (; i < size; i++) {
85                 status = inb(chip->vendor->base + 1);
86                 if ((status & ATML_STATUS_DATA_AVAIL) == 0) {
87                         dev_err(chip->dev,
88                                 "error reading data\n");
89                         return -EIO;
90                 }
91                 *buf++ = inb(chip->vendor->base);
92         }
93
94         /* make sure data available is gone */
95         status = inb(chip->vendor->base + 1);
96         if (status & ATML_STATUS_DATA_AVAIL) {
97                 dev_err(chip->dev, "data available is stuck\n");
98                 return -EIO;
99         }
100
101         return size;
102 }
103
104 static int tpm_atml_send(struct tpm_chip *chip, u8 *buf, size_t count)
105 {
106         int i;
107
108         dev_dbg(chip->dev, "tpm_atml_send:\n");
109         for (i = 0; i < count; i++) {
110                 dev_dbg(chip->dev, "%d 0x%x(%d)\n",  i, buf[i], buf[i]);
111                 outb(buf[i], chip->vendor->base);
112         }
113
114         return count;
115 }
116
117 static void tpm_atml_cancel(struct tpm_chip *chip)
118 {
119         outb(ATML_STATUS_ABORT, chip->vendor->base + 1);
120 }
121
122 static u8 tpm_atml_status(struct tpm_chip *chip)
123 {
124         return inb(chip->vendor->base + 1);
125 }
126
127 static struct file_operations atmel_ops = {
128         .owner = THIS_MODULE,
129         .llseek = no_llseek,
130         .open = tpm_open,
131         .read = tpm_read,
132         .write = tpm_write,
133         .release = tpm_release,
134 };
135
136 static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
137 static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
138 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
139 static DEVICE_ATTR(cancel, S_IWUSR |S_IWGRP, NULL, tpm_store_cancel);
140
141 static struct attribute* atmel_attrs[] = {
142         &dev_attr_pubek.attr,
143         &dev_attr_pcrs.attr,
144         &dev_attr_caps.attr,
145         &dev_attr_cancel.attr,
146         NULL,
147 };
148
149 static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs };
150
151 static struct tpm_vendor_specific tpm_atmel = {
152         .recv = tpm_atml_recv,
153         .send = tpm_atml_send,
154         .cancel = tpm_atml_cancel,
155         .status = tpm_atml_status,
156         .req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
157         .req_complete_val = ATML_STATUS_DATA_AVAIL,
158         .req_canceled = ATML_STATUS_READY,
159         .attr_group = &atmel_attr_grp,
160         .miscdev = { .fops = &atmel_ops, },
161 };
162
163 static struct platform_device *pdev;
164
165 static void __devexit tpm_atml_remove(struct device *dev)
166 {
167         struct tpm_chip *chip = dev_get_drvdata(dev);
168         if (chip) {
169                 release_region(chip->vendor->base, 2);
170                 tpm_remove_hardware(chip->dev);
171         }
172 }
173
174 static struct device_driver atml_drv = {
175         .name = "tpm_atmel",
176         .bus = &platform_bus_type,
177         .owner = THIS_MODULE,
178         .suspend = tpm_pm_suspend,
179         .resume = tpm_pm_resume,
180 };
181
182 static int __init init_atmel(void)
183 {
184         int rc = 0;
185         int lo, hi;
186
187         driver_register(&atml_drv);
188
189         lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
190         hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
191
192         tpm_atmel.base = (hi<<8)|lo;
193
194         /* verify that it is an Atmel part */
195         if (tpm_read_index(TPM_ADDR, 4) != 'A' || tpm_read_index(TPM_ADDR, 5) != 'T'
196             || tpm_read_index(TPM_ADDR, 6) != 'M' || tpm_read_index(TPM_ADDR, 7) != 'L') {
197                 return -ENODEV;
198         }
199
200         /* verify chip version number is 1.1 */
201         if (    (tpm_read_index(TPM_ADDR, 0x00) != 0x01) ||
202                 (tpm_read_index(TPM_ADDR, 0x01) != 0x01 ))
203                 return -ENODEV;
204
205         pdev = kzalloc(sizeof(struct platform_device), GFP_KERNEL);
206         if ( !pdev )
207                 return -ENOMEM;
208
209         pdev->name = "tpm_atmel0";
210         pdev->id = -1;
211         pdev->num_resources = 0;
212         pdev->dev.release = tpm_atml_remove;
213         pdev->dev.driver = &atml_drv;
214
215         if ((rc = platform_device_register(pdev)) < 0) {
216                 kfree(pdev);
217                 pdev = NULL;
218                 return rc;
219         }
220
221         if (request_region(tpm_atmel.base, 2, "tpm_atmel0") == NULL ) {
222                 platform_device_unregister(pdev);
223                 kfree(pdev);
224                 pdev = NULL;
225                 return -EBUSY;
226         }
227
228         if ((rc = tpm_register_hardware(&pdev->dev, &tpm_atmel)) < 0) {
229                 release_region(tpm_atmel.base, 2);
230                 platform_device_unregister(pdev);
231                 kfree(pdev);
232                 pdev = NULL;
233                 return rc;
234         }
235
236         dev_info(&pdev->dev, "Atmel TPM 1.1, Base Address: 0x%x\n",
237                         tpm_atmel.base);
238         return 0;
239 }
240
241 static void __exit cleanup_atmel(void)
242 {
243         if (pdev) {
244                 tpm_atml_remove(&pdev->dev);
245                 platform_device_unregister(pdev);
246                 kfree(pdev);
247                 pdev = NULL;
248         }
249
250         driver_unregister(&atml_drv);
251 }
252
253 module_init(init_atmel);
254 module_exit(cleanup_atmel);
255
256 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
257 MODULE_DESCRIPTION("TPM Driver");
258 MODULE_VERSION("2.0");
259 MODULE_LICENSE("GPL");